Overview: 7 questions will be solved this time.Among them
           ☆7 integer calculations

[1/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 75×2
    Solution:
    75×2 = 150
    Column vertical calculation:

						7	5
✖							2
					1	5	0
					1	5	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 20×10
    Solution:
    20×10 = 200
    Column vertical calculation:

							2	0
✖							1	0
							0	0
						2	0
						2	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 21×50
    Solution:
    21×50 = 1050
    Column vertical calculation:

							2	1
✖							5	0
							0	0
					1	0	5
					1	0	5	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 31×20
    Solution:
    31×20 = 620
    Column vertical calculation:

							3	1
✖							2	0
							0	0
						6	2
						6	2	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 75×20
    Solution:
    75×20 = 1500
    Column vertical calculation:

							7	5
✖							2	0
							0	0
					1	5	0
					1	5	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 20×100
    Solution:
    20×100 = 2000
    Column vertical calculation:

								2	0
✖							1	0	0
								0	0
							0	0
						2	0
						2	0	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 21×500
    Solution:
    21×500 = 10500
    Column vertical calculation:

								2	1
✖							5	0	0
								0	0
							0	0
					1	0	5
					1	0	5	0	0

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>>注：本次最多计算 7 道题。

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